ADS 7251: Difference between revisions
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'''ADS 7251''' is a [[binary star]] system {{val|6.33|ul=parsecs}} ({{val|20.66|ul=light years}}) from the [[Sun]]. The components are near-identical [[red dwarf]]s. |
'''ADS 7251''' is a [[binary star]] system {{val|6.33|ul=parsecs}} ({{val|20.66|ul=light years}}) from the [[Sun]]. The components are near-identical [[red dwarf]]s. |
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ADS 7251 A is 0.06 [[magnitude (astronomy)|magnitudes]] (1.2 times) brighter than ADS 7251 B.{{cn}} A catalogue of MK spectral classes lists both stars as secondary standards, with ADS 7251 A being class K7V and ADS 7251 B being class M0V, noted as being unusual in the brighter star having a later spectral type.<ref name=Kirkpatrick1991>{{cite journal |
ADS 7251 A is 0.06 [[magnitude (astronomy)|magnitudes]] (1.2 times) brighter than ADS 7251 B.{{cn|date=January 2021}} A catalogue of MK spectral classes lists both stars as secondary standards, with ADS 7251 A being class K7V and ADS 7251 B being class M0V, noted as being unusual in the brighter star having a later spectral type.<ref name=Kirkpatrick1991>{{cite journal |
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| display-authors=1 | last1=Kirkpatrick | first1=J. D. |
| display-authors=1 | last1=Kirkpatrick | first1=J. D. |
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| last2=Henry | first2=Todd J. | last3=McCarthy | first3=Donald W. |
| last2=Henry | first2=Todd J. | last3=McCarthy | first3=Donald W. |
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Revision as of 22:20, 5 January 2021
 | This article needs additional citations for verification. (June 2020) |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ursa Major |
| ADS 7251 A | |
| Right ascension | 09h 14m 22.7749s[1] |
| Declination | 52° 41′ 11.792″[1] |
| Apparent magnitude (V) | 7.64[citation needed] |
| ADS 7251 B | |
| Right ascension | 09h 14m 24.6828s[2] |
| Declination | 52h 41m 10.902s[2] |
| Apparent magnitude (V) | 7.71[citation needed] |
| Characteristics | |
| ADS 7251 A (HD 79210) | |
| Spectral type | M0V[3] |
| Apparent magnitude (B) | 9.06 |
| Apparent magnitude (R) | 6.8 |
| Apparent magnitude (I) | 6.0 |
| Apparent magnitude (J) | 4.89 |
| Apparent magnitude (H) | 3.99 |
| Apparent magnitude (K) | 3.99 |
| B−V color index | 1.42 |
| V−R color index | 0.84 |
| R−I color index | 0.8 |
| J−H color index | 0.90 |
| ADS 7251 B (HD 79211) | |
| Spectral type | K7V[3] |
| Apparent magnitude (B) | 9.14 |
| Apparent magnitude (R) | 6.8 |
| Apparent magnitude (I) | 6.0 |
| Apparent magnitude (J) | 4.78 |
| Apparent magnitude (H) | 4.04 |
| Apparent magnitude (K) | 4.14 |
| B−V color index | 1.43 |
| V−R color index | 0.91 |
| R−I color index | 0.8 |
| J−H color index | 0.74 |
| Variable type | Flare star |
| Astrometry | |
| ADS 7251 A (HD 79210) | |
| Radial velocity (Rv) | 11.245±0.0007[1] km/s |
| Proper motion (μ) | RA: −1,545.787±0.018[1] mas/yr Dec.: −569.053±0.018[1] mas/yr |
| Parallax (π) | 157.8879 ± 0.0197 mas[1] |
| Distance | 20.657 ± 0.003 ly (6.3336 ± 0.0008 pc) |
| Absolute magnitude (MV) | 8.69 |
| ADS 7251 B | |
| Radial velocity (Rv) | 12.104±0.0008[2] km/s |
| Proper motion (μ) | RA: −1,573.040±0.018[2] mas/yr Dec.: −659.906±0.018[2] mas/yr |
| Parallax (π) | 157.8825 ± 0.0211 mas[2] |
| Distance | 20.658 ± 0.003 ly (6.3338 ± 0.0008 pc) |
| Details[4] | |
| A | |
| Mass | 0.69±0.07 M☉ |
| Radius | 0.58±0.02 R☉ |
| Luminosity | 1.20±0.01 L☉ |
| Surface gravity (log g) | 4.68±0.07 cgs |
| Temperature | 4,024±51 K |
| Rotation | 16.3+3.5 −1.3 |
| Rotational velocity (v sin i) | 2.0±1.2 km/s |
| B | |
| Mass | 0.64±0.07 M☉ |
| Radius | 0.58±0.03 R☉ |
| Luminosity | 1.20±0.01 L☉ |
| Surface gravity (log g) | 4.68±0.07 cgs |
| Temperature | 4,005±51 K |
| Rotation | 16.61±0.04 |
| Rotational velocity (v sin i) | 2.3±1.5 km/s |
| Age | 1 - 7 Gyr |
| Other designations | |
| A: BD+53°1320, HD 79210, HIP 45343 | |
| B: BD+53°1321, HD 79211, HIP 120005 | |
| Database references | |
| SIMBAD | The system |
| A | |
| B | |
ADS 7251 is a binary star system 6.33 parsecs (20.66 light years) from the Sun. The components are near-identical red dwarfs.
ADS 7251 A is 0.06 magnitudes (1.2 times) brighter than ADS 7251 B.[citation needed] A catalogue of MK spectral classes lists both stars as secondary standards, with ADS 7251 A being class K7V and ADS 7251 B being class M0V, noted as being unusual in the brighter star having a later spectral type.[3] Other publications have described the stars as being both K7V, both M0V, or the primary being K7V and the secondary M0V.[5][4]
Planetary system
ADS 7251 B also known as Gliese 338B or HD 79211, is orbited by one known super-Earth planet detected by radial velocity.[4]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 9.97+1.47 −1.38 M🜨 |
0.141±0.005 | 24.45±0.02 | 0.11+0.11 −0.08 |
— | — |
References
- ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ a b c Kirkpatrick, J. D.; et al. (1991). "A standard stellar spectral sequence in the red/near-infrared - Classes K5 to M9". Astrophysical Journal Supplement Series. 77: 417. Bibcode:1991ApJS...77..417K. doi:10.1086/191611.
- ^ a b c González-Álvarez, E.; Osorio, M. R. Zapatero; Caballero, J. A.; Sanz-Forcada, J.; Béjar, V. J. S.; González-Cuesta, L.; Dreizler, S.; Bauer, F. F.; Rodríguez, E.; Tal-Or, L.; Zechmeister, M. (May 2020). "The CARMENES search for exoplanets around M dwarfs. A super-Earth planet orbiting HD 79211 (GJ 338 B)". Astronomy & Astrophysics. 637: A93. arXiv:2003.13052. Bibcode:2020A&A...637A..93G. doi:10.1051/0004-6361/201937050. ISSN 0004-6361.
- ^ Skiff, B. A. (2014). "VizieR Online Data Catalog: Catalogue of Stellar Spectral Classifications (Skiff, 2009-2016)". VizieR On-line Data Catalog: B/Mk. Originally Published in: Lowell Observatory (October 2014). 1. Bibcode:2014yCat....1.2023S.
